LogLastLoginAtObserver.php

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<?php
namespace Magento\Customer\Observer;

use Magento\Customer\Model\Logger;
use Magento\Framework\Stdlib\DateTime;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class LogLastLoginAtObserver implements ObserverInterface
{
    protected $logger;

    public function __construct(Logger $logger)
    {
        $this->logger = $logger;
    }

    public function execute(Observer $observer)
    {
        $this->logger->log(
            $observer->getEvent()->getCustomer()->getId(),
            ['last_login_at' => (new \DateTime())->format(\Magento\Framework\Stdlib\DateTime::DATETIME_PHP_FORMAT)]
        );
    }
}